Low-density sheet moulding compounds based in hollow glass micro-spheres are being increasing used namely in automotive industry where can present advantages compared with traditional metal, such as: lower weight, less expensive for low volume production in consequence of lower tool costs, no corrosion effects, a more design freedom, etc. These materials are usually classified as syntactic foams if the filler content is relatively high. Syntactic foams are potential good materials for applications where impact loads occurs once they are able to reduce impact force [1,2]. The addition of hollow micro-spheres trends td reduce the Young modulus and ultimate strength [2,3] and even the specific values are only increased in terms of impact force and marginally in flexural modulus for high volume fractions of micro-spheres [2].
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